John north



3 Sheets--Sheet 2. J. NURTH.

Machines for Drilling Back.

No. 134,305. Paiented Dec. 24, 1872.

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L WURTH Machines "Mr firming Back.

No. 134,305. I Patented Dea24,1872.

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JOHN NORTH, OF NEW YORK, N. Y., ASSIGNOB TO THE AMERICAN DIAMOND- DRILLCOMPANY.

IMPROVEMENT IN MAGHiNES FQR DRiLLlNG ROCK.

N Specification forming part of Letters Patent No. 1341,305 datedDecember 24, 1872.

To all whom it may concern:

Be it known that I, JOHN NORTH, of New York, in the county of New Yorkand State of New York, have invented certain new and useful Improvementsin Diamond Rock-Drills, of which the following is a specification:

This invention relates to that class of machines for boring or drillingrock in which diamond drills are employed as a boring medium. The firstfeature of my invention relates to a nove1 method of impartingaprogressive and rotary movement to the drill-spindle; and it consistsin the employment, in connection with an externally screw-threadeddrill-spindle, of a revolving sleeve for imparting a progressive orsliding movement to the spindle for advancing or retracting it from itswork, and of a second-- ary sleeve for rotating the spindle. The secondfeature of my invention consists in the provision of a clutch device'forconnecting the drill-spindle to the sleeve, for imparting a rotarymovement to the same and for disconnecting the spindle from the sleevefor the purpose of enabling the spindle to be retracted at the end ofits stroke. The third feature of my invention consists in the employmentof difi'erential bevel-gearing for revolving the feedingsleeve, saidgearing being so arranged that the feeding-sleeve will revolve at adiminished speed from the sleeve, imparting a rotarymovement to thedrill-spindle, thus effecting the advance of the latter. The fourthfeature of my invention consists in attaching the differentialbevel-gear operating the feedin g-sleeve to the driving-shaft by meansof a friction nut or clamp, so that the latter will automaticallydisconnect itself in the event of a too great resistance to thedrill-point, causing the loosening of the bevel-wheel and a diminishedprogressive movement of the spindle. The lifth feature of my inventionconsists in providing the feedingsleeve with screw nuts or collars forcounteracting or taking up the wear resultin g from the end thrust ofthe drill and spindle. In the drawing, Figure 1 is a perspective view ofthe entire diamond drilling-machine. Fig. 2 is a vertical section of thesame. Fig. 3 is a top view of the same. Fig. 4 represents a verticalcentral section of the driving and feeding gear, the pump, clutchmechanism, 820.

The carriage on. which the drill is mounted consists of a wheeledplatform or base, on which is arranged a turn-table, A possessingvertical pillars or standards A, which, in connection with transversebeams A applied to their upper ends, constitute supporting-frame. Theturn-table A vcarries oscillating engines B, which are intended to beoperated either through the medium of steam or compressed air fortransmitting motion, through the me-' dium of cranks and connectingrods,to the primary vertical shaft G, which has its bear ings in the movablebase A and upper portion of the main frame. Vertical screws Z areprovided for securing the drill-carriage in position when, the drill isin operation by causing said screws to bear against the roof and floorof the tunnel or mine. The main or power shaft 0 communicates motion toan intermediate horizontal driving-shaft, D, by means of bevel-gearwheels at b applied to their respective shafts.

Said shaft D and the entire drill mechanism is mounted in a secondaryframe, E, which is located within the stationary or main frame A.

.shafts by bevel-gearin g. The adjustable frame E carries also a forceor suction pump, P, which is actuated through the medium of connectingrod 0 applied to a crank or wrist-pin on a spurwheel, j, which meshesinto a spur-wheel, g, on the primary shaft 0. The gear-wheels a b onsaid shaft are so connected with the same, by splines and feathers, thatthey may receive a vertical adjustment corresponding with that of theframe E, thus always preserving their proper positions in relation toeach other. A movable head or disk, G, susceptible of being rotated on ahorizontal axis, which generally is formed by the horizontaldriving-shaft D passing through a tubular extension formedon the head,carries the drilling devices, which are thus enabled to be directed atany desired angle in respect to the walls of the tunnel or shaft. Thehead G is formed with bearings G G at its opposite ends for the journalscf the drill-spindle or shaft F, which is made tubular and provided witha continuous ex-. ternal screw-thread, as shown. A sleeve, I I, cast orformed with a bevel-gear wheel, h, 1s inserted loosely in the bearing Gand through it extends the drill-spindle F, which also passes throughthe bushing H in the opposite bearing G The gear-wheel h, on the sleeveH, meshes into a corresponding bevel-wheel, i, on the end of thedriving-shaft D for imparting a rotary movement to the drill-spindlewhen the sleeve is connected with the latter by means of a couplingcollar or clutch, K. Said clutch surrounds the screw-spindle and isconnected with the same by a spline and feather, and with the sleeve Hby means of interlocking projections or other suitable devices. Thedrill-spindle receives a progressive movement when in operation throughthe medium of a revolving sleeve, I, which is provided with an internalscrew-thread corresponding with the thread of the screw-shaft. Saidsleeve I carries a bevel-gear wheel, L, arranged concentrically with thedrivinggear 70 on the sleeve H, and meshing with a bevel-wheel, M, onthe driving-shaft D. The gear-wheel M is held in frictional contact withthe wheel 6, and is clamped. against the*face of the same by means of anut, S, applied to the screw-threaded end of the shaft D, afriction-washer being interposed between the bevel-wheel and nut. Theadvance of the drill-spindle simultaneously with the rotation of thesame is effected by forming the bevel-wheel M with a less number ofteeth (one or more) than the sleeve-gear L, while the wheels h t haveeven-numbered teeth, thus causing the feeding-sleeve to revolve slowerthan the screw spindle. The drill-spindle carries at its end a diamondpoint or drill, R, which is usually of a tubular form, so that when inoperation it will cut around the circumference of the hole, leaving acore within the bore of the drill, which is extracted when the drill iswithdrawn. \Vater is conducted to the drill for washing away thefragments of rock and dust removed by the drill through the tubularspindle and a suitable pipe or hose connected with the pump 1?. The

direction of the drill to its work is determined by the rotating head ordisk G, which is capable of being adjusted for boring at any desiredangle in a vertical plane, while the neoesssary adjustment for operationin a lateral direction is accomplished by revolving the turn-table A,the desired elevation of the drilling mechanism being in all caseseffected by the adjustable frame E. The turn-table is provided withsockets for the insertion of levers for revolving the same, and withclamps O for holding the same in a stationary position. Similar clampsare combined with the revolving head G for the same purpose.

The carriage and the drill mechanism having been properly adjusted, theoperation of boring is commenced by imparting a rotary movement to thehorizontal shaft D, through the medium of the engines andpower-transmitting devices, which will cause the revolution of thesleeve H, and a corresponding movement of the drill-spindle, if theclutch K is connected with the former. Simultaneously with therevolution of the spindle a progressive movement is imparted to the samefor feeding it up to its work, as the boring operation progresses, bymeans of the revolving screwthreaded sleeve I and differentialbevel-gearing L M. It the drill should encounter an obstacle of toogreat hardness to be easily penetrated, the resistance ofi'ered to thedrill will cause the nut S on the shaft D to partially disengage itself,thus removing the frictional contact between the bevel-wheels M t,causing the wheel M to slip, and thus diminish the progressive movementof the spindle. The drill is retracted at the end of each stroke for arepetition of the same, by disengaging the clutch or cap K from thesleeve H. For this purpose a collar, screw-threaded, is fixed to thebearing G and receives a screw-cap,W, which is provided with an internalstud or pin, Q, projecting into a continuous circumferentia-l groove inthe clutch K. A single turn of the cap disengages the clutch or couplingK from the sleeve H, and the latter from the drill-spindle, thusarresting the rotation of the same. The drill-spindle is now grasped inthe hand of the operator for preventing its casuat rotation, and bymeans of the feedingsleeve I the drill-spindle is withdrawn with therapidity naturally due to the screw-thread on the spindle.

The .drill may thus be retracted without incurring the loss of the coreand endangering the safety of the diamonds, results certain to ensue ifthe rotation of the drill be not then arrested, When the drill is to bemoved up again to its work, it is only necessary to turn the clutch toits normal position for coupling the driving-sleeve to thedrill-spindle. ,The feeding gear M is then temporarily unclamped fromthe driving-gear, and the sleeve held from revolving while the drill isrun up to its work, after which the feeding-gear is again clamped to thedriving-gear, and the drilling operation repeated. 7

In order to take up the wear resulting from the end thrust of the drilland spindle, I pro vide the feeding-sleeve with a nut or nuts, X Y,encircling and fitted on an exterior thread on the sleeve.

Having thus fully described my invention, what I claim as new, anddesire to secure by Letters Patent, is-

1. In a rock-drill, the arrangement of the sleeves H and I, forimparting a simultaneous rotary and progressive movement to thedrillspindle, when the sleeve H is constructed substantially asdescribed, so that the rotation of the spindle can be arrested as thesame is re tracted.

2. In a rock-drill, the clutch K and sleeve H, in combination with thedrill-spindle F and driving-wheels h 1 substantially as and for thepurpose specified. 4 s

, r eases acting the effects of wear, substantially as set forth.

In testimony that I claim the foregoing I have hereunto set my hand this16th day of December, 1872.

JOHN NORTH,

Witnesses:

J AMES L. NoRRIs, ALBERT H. Nonms.

